This advisory announces a number of security vulnerabilities in earlier versions of Crowd that we have found and fixed in Crowd 2.0.4. In addition to releasing Crowd 2.0.4, we also provide point releases for earlier versions of Crowd to fix the vulnerabilities reported here.

In this advisory:

XSS Vulnerabilities

Severity

Atlassian rates these vulnerabilities as high, according to the scale published in Severity Levels for Security Issues. The scale allows us to rank a vulnerability as critical, high, moderate or low.

Risk Assessment

We have identified and fixed a number of cross-site scripting (XSS) vulnerabilities which may affect Crowd instances in a public environment.

• An attacker might take advantage of the vulnerability to steal other users' session cookies or other credentials, by sending the credentials back to such an attacker's own web server.
• An attacker's text and script might be displayed to other people viewing the Crowd page. This is potentially damaging to your company's reputation.

You can read more about XSS attacks at cgisecurity, CERT and other places on the web.

Vulnerability

The table below lists the affected areas of Crowd. These XSS vulnerabilities exist in all versions of Crowd, up to and including Crowd 2.0.3.

Risk Mitigation

To address the issues, you should upgrade Crowd as soon as possible. If you cannot upgrade immediately, you should configure your firewall to block Internet access to Crowd.

Fix

Crowd 2.0.4 fixes all of these issues and introduces some nice improvements too. See the release notes. You can download Crowd 2.0.4 from the download centre.

If you cannot upgrade to Crowd 2.0.4, please download the relevant upgrade file for your version of Crowd from the download centre:

• If you have Crowd 1.6.x — upgrade to Crowd 1.6.3 (see the release notes and upgrade guide).
• If you have Crowd 1.5.x — upgrade to Crowd 1.5.3 (see the release notes and upgrade guide).
• If you have Crowd 1.4.x — upgrade to Crowd 1.4.8 (see the release notes and upgrade guide).